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  <div class="section" id="s-django-1-4-22-release-notes">
<span id="django-1-4-22-release-notes"></span><h1>Django 1.4.22 release notes<a class="headerlink" href="#django-1-4-22-release-notes" title="Permalink to this headline">¶</a></h1>
<p><em>August 18, 2015</em></p>
<p>Django 1.4.22 fixes a security issue in 1.4.21.</p>
<p>It also fixes support with pip 7+ by disabling wheel support. Older versions
of 1.4 would silently build a broken wheel when installed with those versions
of pip.</p>
<div class="section" id="s-denial-of-service-possibility-in-logout-view-by-filling-session-store">
<span id="denial-of-service-possibility-in-logout-view-by-filling-session-store"></span><h2>Denial-of-service possibility in <code class="docutils literal notranslate"><span class="pre">logout()</span></code> view by filling session store<a class="headerlink" href="#denial-of-service-possibility-in-logout-view-by-filling-session-store" title="Permalink to this headline">¶</a></h2>
<p>Previously, a session could be created when anonymously accessing the
<a class="reference internal" href="../topics/auth/default.html#django.contrib.auth.views.logout" title="django.contrib.auth.views.logout"><code class="xref py py-func docutils literal notranslate"><span class="pre">django.contrib.auth.views.logout()</span></code></a> view (provided it wasn’t decorated
with <a class="reference internal" href="../topics/auth/default.html#django.contrib.auth.decorators.login_required" title="django.contrib.auth.decorators.login_required"><code class="xref py py-func docutils literal notranslate"><span class="pre">login_required()</span></code></a> as done in the
admin). This could allow an attacker to easily create many new session records
by sending repeated requests, potentially filling up the session store or
causing other users’ session records to be evicted.</p>
<p>The <a class="reference internal" href="../ref/middleware.html#django.contrib.sessions.middleware.SessionMiddleware" title="django.contrib.sessions.middleware.SessionMiddleware"><code class="xref py py-class docutils literal notranslate"><span class="pre">SessionMiddleware</span></code></a> has been
modified to no longer create empty session records, including when
<a class="reference internal" href="../ref/settings.html#std:setting-SESSION_SAVE_EVERY_REQUEST"><code class="xref std std-setting docutils literal notranslate"><span class="pre">SESSION_SAVE_EVERY_REQUEST</span></code></a> is active.</p>
<p>Additionally, the <code class="docutils literal notranslate"><span class="pre">contrib.sessions.backends.base.SessionBase.flush()</span></code> and
<code class="docutils literal notranslate"><span class="pre">cache_db.SessionStore.flush()</span></code> methods have been modified to avoid creating
a new empty session. Maintainers of third-party session backends should check
if the same vulnerability is present in their backend and correct it if so.</p>
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<li><a class="reference internal" href="#denial-of-service-possibility-in-logout-view-by-filling-session-store">Denial-of-service possibility in <code class="docutils literal notranslate"><span class="pre">logout()</span></code> view by filling session store</a></li>
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